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The mechanic is the reason it spread. Merging two of anything into something bigger is instantly readable, so nobody needs a tutorial. What is not obvious is that the merges cascade: a merge changes the physics of the pile, which settles, which can trigger another merge, which settles again. A single well-placed cherry can collapse half the box in one chain. That gap between how simple it looks and how deep it plays is exactly what makes it hard to put down.
The tension comes from a rule that sounds mild and is not: you lose when fruit crosses the top line. Since fruit only grows by merging, and merging requires space, every drop is a bet — you are spending room now for the chance of freeing more room shortly. Play greedily and the box fills with mid-sized fruit you cannot combine. Play carefully and you run out of turns before reaching the big ones.
It sits under Cosy, Puzzle and Casual here, and all three earn their place. Puzzle because positioning genuinely matters and good players are noticeably better. Casual because a single click does everything and a round is over in minutes. Cosy because there is no timer, no opponent and no penalty for a bad run beyond starting again — the pressure is entirely self-imposed, which is why it is such a common background game.